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Sacrum
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=== Variations === In some cases, the sacrum will consist of six pieces or be reduced in number to four.<ref>{{Cite book|url=https://archive.org/details/anatomyhumanbod00lewigoog|quote=sacrum will consist of six pieces.|title=Anatomy of the Human Body|last=Gray|first=Henry|date=1918|publisher=Lea & Febiger|pages=[https://archive.org/details/anatomyhumanbod00lewigoog/page/n108 111]|language=en}}</ref> The bodies of the first and second vertebrae may fail to unite.
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